I added two new websites to downloads section where I'll be posting development of Layout/Previs level face and body rigs. The examples are not production level but I plan on posting updates to them so maybe they may be helpful to students.
Layout Face Rigs: anoziefacerigs dot blogspot dot com
Layout Body Rigs: anoziebodyrigs dot blogspot dot com
Hope you find them helpful.
This is still a work in progress ...